<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Oracle Forge Class
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_oci8_forge extends CI_DB_forge {

	/**
	 * Create database
	 *
	 * @access	public
	 * @param	string	the database name
	 * @return	bool
	 */
	function _create_database($name)
	{
		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Drop database
	 *
	 * @access	private
	 * @param	string	the database name
	 * @return	bool
	 */
	function _drop_database($name)
	{
		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Create Table
	 *
	 * @access	private
	 * @param	string	the table name
	 * @param	array	the fields
	 * @param	mixed	primary key(s)
	 * @param	mixed	key(s)
	 * @param	boolean	should 'IF NOT EXISTS' be added to the SQL
	 * @return	bool
	 */
	function _create_table($table, $fields, $primary_keys, $keys, $if_not_exists)
	{
		$sql = 'CREATE TABLE ';

		if ($if_not_exists === TRUE)
		{
			$sql .= 'IF NOT EXISTS ';
		}

						 $sql .= $this->db->_escape_identifiers($table)." (";
						 $current_field_count = 0;

						 foreach ($fields as $field=>$attributes)
						 {
						 	// Numeric field names aren't allowed in databases, so if the key is
						 	// numeric, we know it was assigned by PHP and the developer manually
						 	// entered the field information, so we'll simply add it to the list
						 	if (is_numeric($field))
						 	{
						 		$sql .= "\n\t$attributes";
						 	}
						 	else
						 	{
						 		$attributes = array_change_key_case($attributes, CASE_UPPER);

						 		$sql .= "\n\t".$this->db->_protect_identifiers($field);

						 		$sql .=  ' '.$attributes['TYPE'];

						 		if (array_key_exists('CONSTRAINT', $attributes))
						 		{
						 			$sql .= '('.$attributes['CONSTRAINT'].')';
						 		}

						 		if (array_key_exists('UNSIGNED', $attributes) && $attributes['UNSIGNED'] === TRUE)
						 		{
						 			$sql .= ' UNSIGNED';
						 		}

						 		if (array_key_exists('DEFAULT', $attributes))
						 		{
						 			$sql .= ' DEFAULT \''.$attributes['DEFAULT'].'\'';
						 		}

						 		if (array_key_exists('NULL', $attributes) && $attributes['NULL'] === TRUE)
						 		{
						 			$sql .= ' NULL';
						 		}
						 		else
						 		{
						 			$sql .= ' NOT NULL';
						 		}

						 		if (array_key_exists('AUTO_INCREMENT', $attributes) && $attributes['AUTO_INCREMENT'] === TRUE)
						 		{
						 			$sql .= ' AUTO_INCREMENT';
						 		}
						 	}

						 	// don't add a comma on the end of the last field
						 	if (++$current_field_count < count($fields))
						 	{
						 		$sql .= ',';
						 	}
						 }

						 if (count($primary_keys) > 0)
						 {
						 	$primary_keys = $this->db->_protect_identifiers($primary_keys);
						 	$sql .= ",\n\tPRIMARY KEY (" . implode(', ', $primary_keys) . ")";
						 }

						 if (is_array($keys) && count($keys) > 0)
						 {
						 	foreach ($keys as $key)
						 	{
						 		if (is_array($key))
						 		{
						 			$key = $this->db->_protect_identifiers($key);
						 		}
								else
								{
									$key = array($this->db->_protect_identifiers($key));
								}

								$sql .= ",\n\tUNIQUE COLUMNS (" . implode(', ', $key) . ")";
						 	}
						 }

						 $sql .= "\n)";

						 return $sql;
	}

	// --------------------------------------------------------------------

	/**
	 * Drop Table
	 *
	 * @access	private
	 * @return	bool
	 */
	function _drop_table($table)
	{
		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Alter table query
	 *
	 * Generates a platform-specific query so that a table can be altered
	 * Called by add_column(), drop_column(), and column_alter(),
	 *
	 * @access	private
	 * @param	string	the ALTER type (ADD, DROP, CHANGE)
	 * @param	string	the column name
	 * @param	string	the table name
	 * @param	string	the column definition
	 * @param	string	the default value
	 * @param	boolean	should 'NOT NULL' be added
	 * @param	string	the field after which we should add the new field
	 * @return	object
	 */
	function _alter_table($alter_type, $table, $column_name, $column_definition = '', $default_value = '', $null = '', $after_field = '')
	{
						$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table)." $alter_type ".$this->db->_protect_identifiers($column_name);

						// DROP has everything it needs now.
						if ($alter_type == 'DROP')
						{
							return $sql;
						}

						$sql .= " $column_definition";

						if ($default_value != '')
						{
							$sql .= " DEFAULT \"$default_value\"";
						}

						if ($null === NULL)
						{
							$sql .= ' NULL';
						}
						else
						{
							$sql .= ' NOT NULL';
						}

						if ($after_field != '')
						{
							$sql .= ' AFTER ' . $this->db->_protect_identifiers($after_field);
						}

						return $sql;

	}

	// --------------------------------------------------------------------

	/**
	 * Rename a table
	 *
	 * Generates a platform-specific query so that a table can be renamed
	 *
	 * @access	private
	 * @param	string	the old table name
	 * @param	string	the new table name
	 * @return	string
	 */
	function _rename_table($table_name, $new_table_name)
	{
		$sql = 'ALTER TABLE '.$this->db->_protect_identifiers($table_name)." RENAME TO ".$this->db->_protect_identifiers($new_table_name);
		return $sql;
	}


}

/* End of file oci8_forge.php */
/* Location: ./system/database/drivers/oci8/oci8_forge.php */